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Mendoza Spring: medium velocity model

5.04 reviews
Mendoza Spring: medium.

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PY-A-2539

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Spare part: Mendoza Spring: medium velocity model
Model number RRM-363


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Item Code: Mendoza-RRM-363 [PY-A-2539]
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Average Customer Review

5.0 (4 reviews)
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5.0 5.0

5.0 5.0

By Lee A. from USA on 2013-08-09
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0.00 ratings

Things I liked: good quality. good service from Pyramyd Air

Things I would have changed: nothing

What others should know: drop in replacement for Gamo Silent Cat. don't pay for two day shipping. Came in two days with standard shipping.

By ENRICO from USA on 2013-12-05
I bought this spring for my Winchester 722X. This is a drop in replacement for this rifle. Before replacement, my rifle was chrono at 419 fps with the std dev of 42 fps. Now it's 560 fps with std dev of 14 fps. I don't know the original spec. Before the spring broke coz I didnt have a chrono back then. Overall I'm happy with this purchase.
By Edith from USA on 2013-11-25
Enrico--Pyramyd Air's tech department measured this spring. It's 10.5" long, .785" outside diameter and .125" wire diameter. You'll have to measure your Winchester 722X spring to see if this is a good match.
By ENRICO from USA on 2013-11-22
could you please give me the dimension on this spring. coz I'm looking for a replacement for my winchester 722x . I'm just wondering if this would work as a replacement. thank you.
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5.0 5.0

5.0 5.0

By robert from USA on 2013-06-01
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0.00 ratings

Things I liked: i recieved a nicely finished spring and the ends were rounded and polished . fit nice. it made my rm-377 shoot better than it has in a long time

Things I would have changed: none

What others should know: a mendoza is a bear to work on,be sure and use a compressor

 
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5.0 5.0

5.0 5.0

By Andy from Canada on 2013-01-11
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5.01 rating

Things I liked: I gought this spring for a GAMO .22 Big Cat, and let me just say The difference is like night and day.My Cat arrived very under-powered, and had a hard time even sending a pellet down range. I first tried a Crosman Quest 1000 spring, but it was way too powerful, and within a hundred shots the gun literaly destroyed itself. I liked the gun so much,a nd it not being too expensive decided to try it again, This time with the Mendoza spring, 700 shots later, No Problem's, It's smoothed itself out quite nicely, and is a Joy to shoot now, No spring "Twang", just a nice "Thud".

Things I would have changed: absolutely nothing, It's a quality product. that's just the right length for many airgun's, not just the model it was originally intended for.

What others should know: This is a high quality spring, with high tensal strength, The ends are flat, and highly polished, something I've only seen with a Mendoza spring, It just goes to show you, If the spring is that good, imagine what their gun's must be like. Cheer's, and Happy Huntin', Andy.

By Andy from Canada on 2015-08-01
Vicente, The power increase is like night to day, w/ a reguler 14.3gr Crosman Dome, I'm getting close to 900 fps, as you would expect the heavier the pellet the lower the muzle velocity, w/ 18+gr Skenco UltraMags, I'm getting 860fps on the chrono . I shot at around 6" from the chrono, for maximum information. Sadly since I've started shooting my Hatsan PcP's, I rarely take my springers out ecept for a couple shots every few weeks to keep everything internal lubed and shooting fine. But You can't go wrong with this spring and a Gamo Big Cat,,What a difference a little thing like changing your mainspring does. Cheer's, Andy.
By VICENTE from Colombia on 2014-07-30
I also have a Big Cat .22, at the chrony the Crosman Premier 14.3 gr. average 680 FPS and the Beeman Silver Bear 12.65 gr. 725. Could you compare your speed, please? I am also interesed in this spring to get more speed if possible.
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  • Mike from USA asked:

    Is this the spring that goes inside of the clip .of the xbg

    • justin from USA asked:

      Will this fit crosman RM377

      • anthony from USA asked:

        will this spring fit my swissarms tec1 .177 cal

        Compatible with Mendoza Spring: medium velocity model

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